Ars Poetica is a famous work of literary criticism.
It was written by the Roman poet and critic Horace.
The title Ars Poetica means:
\[
\text{The Art of Poetry}.
\]
In this work, Horace discusses poetic composition, decorum, unity, style, and the purpose of poetry.
He is also associated with the idea that poetry should both instruct and delight.
Longinus wrote On the Sublime.
Aristotle wrote Poetics.
Sir Philip Sidney wrote An Apology for Poetry.
Therefore, Ars Poetica is written by:
\[
\text{Horace}.
\]